1 
BULI.ETIX OF THE HYGIENIC LABORATORY, 
Treasur%i Deportment, U. .S'. Marine- Hospital Service, 
WALTER WYaLAX, Surfjeon-General. 
I 
II 
'! 
WITHOUT APPARATUS 
M. J. ROSENAU, 
PASSED ASSISTANT SURGEON, DIRECTOR HYGIENIC LABORATORY, 
U. S. MARINE-HOSPITAL SERVICE. 
WA^SHINGETOIN^. D. C. 
r 
WASHINGTON : 
GOVERNMENT PRINTING OFFICE. 
1900 . 
